The logmar visual acuity testing for the Uveitic Glaucoma study has been adapted from the Early Treatment of Diabetic Retinopathy (ETDRS) at 4 metres. The logmar visual acuity scale facilitates statistical analysis and simplifies quantification of acuity at various distances. The right eye is tested with ETDRS logmar chart 1, then the left eye is tested with ETDRS logmar chart 2. Each chart is hidden from view until the eye being examined is ready for testing.